TY  - JOUR
AU  - Nourmohammadi, Rouhollah 
AU  - Hosseini, Seyed Mohammad 
AU  - Farhangfar, Homayoun 
PY  - 2010
TI  - Influence of Citric Acid and Microbial Phytase on Growth Performance and Carcass Characteristics of Broiler Chickens
JF  - American Journal of Animal and Veterinary Sciences
VL  - 5
IS  - 4
DO  - 10.3844/ajavsp.2010.282.288
UR  - https://thescipub.com/abstract/ajavsp.2010.282.288
AB  - Problem statement: The aim of this study was to investigated the effects of adding citric acid and microbial phytase supplementation (Natuphos®) on growth performance and carcass characteristics of broiler chickens fed corn soybean meal base diets. Approach: The experiment included nine treatments with 10 birds in each replicate using a 3×3 factorial design for two main factors of citric acid (0, 3 and 6%) and three phytase enzyme (0, 500 and 1000 IU kg−1). The diets were formulated based upon corn-soybean meal 7 to 21 and 22 to 42 day periods. Results: Using different levels of citric acid in diets had no effect on internal organs (except relative heart weight), whereas, diets containing 6% citric acid decreased feed intake, body weight gain and carcass yield (p